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Experimental Therapeutics, Preclinical Pharmacology |
Divisions of Medical Oncology [R. J. K.] and Pathology [R. D. G.] and Department of Advanced Therapeutics [R. J. K., M. B. B., R. N., J. H. G., F. M. P. W.], British Columbia Cancer Agency, Vancouver V5Z 4E6, and Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver V6T 2B5 [M. B. B., F. M. P. W.], British Columbia, Canada
Cancers overexpressing Bcl-2 protein, which prevents programmed cell death (apoptosis), are less sensitive to stresses that produce cellular damage, including chemotherapy. If the level of Bcl-2 protein can be reduced sufficiently using antisense oligonucleotides (ASOs) targeting the gene message, then cytotoxic agents may be rendered more effective in eliminating disease and increasing cure rate. Preclinical studies in SCID mice bearing Bcl-2 overexpressing systemic human B-cell lymphoma (DoHH2) were undertaken to support development of a clinical trial. These data confirm that a combination of an ASO (5 mg/kg) targeting bcl-2 and a low dose of cyclophosphamide (35 mg/kg) was an effective strategy, leading to the eradication of the DoHH2 cells in vivo and cure of the animals. When mice deficient in natural killer cell activity were treated with an ASO, similar results were observed, suggesting that ASO stimulation of the host immune system was not a significant factor in elimination of lymphoma cells. These studies indicate that therapeutic strategies involving the use of an ASO targeting bcl-2 in combination with a cytotoxic agent may improve clinical outcomes.
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